[Asterisk-Users] Looking for advice on cell carrier's default "Un avaliable" message

[Eric "ManxPower" Wieling]

Andrew Kohlsmith wrote:
> On Monday 05 December 2005 13:39, Colin Anderson wrote:
>> That appears to work *perfectly* but I don't get it. With the 'r' option
>> on, how can Asterisk determine that the user has answered the phone as
>> opposed to the carrier? Is it a signal that the carrier is sending?
>> Anyway, thanks. Works like a hot damn.
> 
> With the carrier voicemail turned off (not subscribed to) the carrier does not 
> answer the line to say "this person is out of the service area or has their 
> phone off" -- it's the same trick (early audio) used with digital lines to 
> inform the caller of a problem without charging them for the privilege.

This is the ONLY use for the "r" option of Dial that I have found.